#通过include的方式引入
#输出变量OpenCV_INCLUDE_DIRS 和 OpenCV_LIBS
if(NOT DEFINED OpenCV_LIBS)
    find_package(OpenCV)
    message(STATUS "\${OpenCV_INCLUDE_DIRS}:${OpenCV_INCLUDE_DIRS}")
    message(STATUS "\${OpenCV_LIBS}:${OpenCV_LIBS}")
endif()
